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can be separated from shale deep understood ground. but some experts say chemicals used in the process can poison drinking water and as armen keteyian reports, hundreds showed up at a federal hearing today in western new york to debate the issue. >> safe drilling now! >> reporter: the e.p.a. hearings in binghampton have become a battleground over fracking, a method of extraction that has high rewards for companies and some say higher risks for communities. what's driving the drilling rush are advances in hydraulic fracturing, or hydrofracking, a process whereby millions of gallons of water, sand and chemicals are blasted deep understood ground, forcing cracks in the shale, freeing natural gas for collection. it's at the surface from where problems have been reported. like blowouts and spills into groundwater. and as depicted in the hbo documentary "gasland," ignition at the kitchen sink. >> whoa! >> there's no such thing as zero-impact drilling. >> reporter: binghamton, new york, sits near the marcellus shale, an energy rich formation stretching from new york to tennessee that's estima
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